Dorman 526-603 Lateral Arm - Rear Left Upper Rearward

Dorman 526-603 Rear Lateral Arm

Dorman 526-603 is a steel lateral arm engineered as a standard replacement for the original rear suspension arm on select Audi, Porsche, and Volkswagen platform applications. It is built with rubber bushings, a painted black finish, and a stamped beam-style construction for direct-fit service on the rear left upper rearward position.

Key Features

• Steel construction with a stamped beam design
• Painted black finish with semi-gloss appearance
• Rubber bushings included and pre-greased
• Dust boot included
• End 1 and End 2 use bushing attachment points
• Standard replacement grade for OE-style service
• No ball joint, grease fittings, or mounting hardware included

Detailed Description

This Dorman lateral arm, part number 526-603, is built for the rear left upper rearward suspension location on 2017-2025 Audi Q7, 2019-2025 Audi Q8, and 2019-2024 Porsche Cayenne models with steel arms. It is designed to replace the original equipment arm with the correct length, bushing layout, and mounting-hole sizing for the specified application. The steel body and rubber bushings are suited for restoring suspension geometry and rear axle control in vehicles that rely on this arm for lateral location.

This part cross-references 4M0505397Q and 4M0505397R for the same application.

What It Helps Address

• Rear suspension looseness or instability
• Clunking or knocking from the rear suspension area
• Excessive play from worn bushings
• Uneven rear tire wear caused by suspension geometry issues
• Handling drift or reduced rear-end control

Installation Notes and Tips

Verify the vehicle is equipped with steel arms before ordering. Confirm the rear left upper rearward position and match the original arm length, bushing style, and mounting-hole dimensions before installation. Because mounting hardware is not included, reuse or source the correct fasteners as required by the vehicle service procedure. A professional alignment is recommended after suspension component replacement.

Quality Assurance

Dorman engineers this lateral arm as a direct replacement for the original equipment on the listed Audi Q7, Audi Q8, and Porsche Cayenne applications. It is rigorously tested for fit and function to support reliable suspension service on the specified vehicles.